Compilare: user.cpp: In function ‘int main()’: user.cpp:15:32: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("plaja2.in","r",stdin); ^ user.cpp:16:34: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("plaja2.out","w",stdout); ^ user.cpp: In function ‘void Next()’: user.cpp:58:44: warning: ignoring return value of ‘size_t fread(void*, size_t, size_t, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] std::fread(s, 1, Lim, stdin), u = 0; ^ user.cpp: In function ‘int main()’: user.cpp:26:29: warning: ‘rez’ may be used uninitialized in this function [-Wmaybe-uninitialized] long long st,dr,sol = 0,rez; ^~~